If Mom's religious, I highly suggest getting her the Jackhammer Jesus.
Jesus fucking Christ. Literally. This extremely blasphemous dildo features a fairly realistic dickhead at the tip, and a crucifix complete with a figure of our crucified Lord at the base. A very hefty dildo with lots of ridges and bulges, it's perfect for playing debauched priest, naughty nun, or re-enacting The Exorcist. 10" total length (7-1/4" insertable length), 1-1/2" in diameter at the head, 1-3/4" in diameter at the widest insertable point (Jesus's knees). Do note that the shape of this dildo means it can't be used with a harness. Glow-in-the-Dark White (a pearlescent white).